Intraocular Pressure and Blood Flow Through the Uvea

Effects of Sympathetic Nerve Stimulation on Long Posterior Ciliary Artery Blood Flow in Cats

“…Basal blood flow levels in the lateral LPCA found in this study (approximately 0.6 ml/min) are consistent with earlier results seen with the cat LPCA (15). The results also are consistent with reports by others concerning total uveal blood flow in rabbits and cats (16)(17)(18). Using a microsphere technique, Alm and Bill (19) estimated total uveal blood flow in the cat to be about 1.1 to 1.2 ml/min.…”

Effects of Sympathetic Nerve Stimulation on Long Posterior Ciliary Artery Blood Flow in Cats

“…Basal blood flow levels in the lateral LPCA found in this study (approximately 0.6 ml/min) are consistent with earlier results seen with the cat LPCA (15). The results also are consistent with reports by others concerning total uveal blood flow in rabbits and cats (16)(17)(18). Using a microsphere technique, Alm and Bill (19) estimated total uveal blood flow in the cat to be about 1.1 to 1.2 ml/min.…”

Numerical modelling of conductive and convective heat transfers in retinal laser applications

“…Assuming global convection as only possible in the analytical method, the perfusion coefficient would only be 0.07 s À1 (Figure 10). The local perfusion value is much closer to the values estimated by Birngruber [6] from experiments (0.28 s À1 [13,14], 0.30 s À1 [12]). Moreover, the temperature reduction due to global convection with a coefficient Q ¼ 0.30 s À1 reaches 37% of the temperature calculated when no convection is considered (Q ¼ 0 s À1 ) whereas it is only of 15% when a local convection with the same coefficient is assumed.…”

Cellular and physiological mechanisms underlying blood flow regulation in the retina and choroid in health and disease

“…A linear or close to linear pressure-flow relationship was reported in early animal studies using a variety of techniques, indicating that the choroidal circulation behaves like a passive vascular bed (Bill, 1962; Friedman, 1970; Armaly and Araki, 1975; Gherezghiher et al, 1991). More recent studies have reported, in contrast, that moderate decreases in perfusion pressure, experimentally adjusted by manipulating intraocular pressure or mean arterial pressure, result in significant compensation in choroidal blood flow (Riva et al, 1997b; Bogner et al, 2011; Polska et al, 2007) (Fig.…”

Effects of Sympathetic Nerve Stimulation on Long Posterior Ciliary Artery Blood Flow in Cats

“…Basal blood flow levels in the lateral LPCA found in this study (approximately 0.6 ml/min) are consistent with earlier results seen with the cat LPCA (15). The results also are consistent with reports by others concerning total uveal blood flow in rabbits and cats (16)(17)(18). Using a microsphere technique, Alm and Bill (19) estimated total uveal blood flow in the cat to be about 1.1 to 1.2 ml/min.…”

Numerical modelling of conductive and convective heat transfers in retinal laser applications

“…Assuming global convection as only possible in the analytical method, the perfusion coefficient would only be 0.07 s À1 (Figure 10). The local perfusion value is much closer to the values estimated by Birngruber [6] from experiments (0.28 s À1 [13,14], 0.30 s À1 [12]). Moreover, the temperature reduction due to global convection with a coefficient Q ¼ 0.30 s À1 reaches 37% of the temperature calculated when no convection is considered (Q ¼ 0 s À1 ) whereas it is only of 15% when a local convection with the same coefficient is assumed.…”

Cellular and physiological mechanisms underlying blood flow regulation in the retina and choroid in health and disease

“…A linear or close to linear pressure-flow relationship was reported in early animal studies using a variety of techniques, indicating that the choroidal circulation behaves like a passive vascular bed (Bill, 1962; Friedman, 1970; Armaly and Araki, 1975; Gherezghiher et al, 1991). More recent studies have reported, in contrast, that moderate decreases in perfusion pressure, experimentally adjusted by manipulating intraocular pressure or mean arterial pressure, result in significant compensation in choroidal blood flow (Riva et al, 1997b; Bogner et al, 2011; Polska et al, 2007) (Fig.…”

Effects of Sympathetic Nerve Stimulation on Long Posterior Ciliary Artery Blood Flow in Cats

“…Basal blood flow levels in the lateral LPCA found in this study (approximately 0.6 ml/min) are consistent with earlier results seen with the cat LPCA (15). The results also are consistent with reports by others concerning total uveal blood flow in rabbits and cats (16)(17)(18). Using a microsphere technique, Alm and Bill (19) estimated total uveal blood flow in the cat to be about 1.1 to 1.2 ml/min.…”

Numerical modelling of conductive and convective heat transfers in retinal laser applications

“…Assuming global convection as only possible in the analytical method, the perfusion coefficient would only be 0.07 s À1 (Figure 10). The local perfusion value is much closer to the values estimated by Birngruber [6] from experiments (0.28 s À1 [13,14], 0.30 s À1 [12]). Moreover, the temperature reduction due to global convection with a coefficient Q ¼ 0.30 s À1 reaches 37% of the temperature calculated when no convection is considered (Q ¼ 0 s À1 ) whereas it is only of 15% when a local convection with the same coefficient is assumed.…”

Cellular and physiological mechanisms underlying blood flow regulation in the retina and choroid in health and disease

“…A linear or close to linear pressure-flow relationship was reported in early animal studies using a variety of techniques, indicating that the choroidal circulation behaves like a passive vascular bed (Bill, 1962; Friedman, 1970; Armaly and Araki, 1975; Gherezghiher et al, 1991). More recent studies have reported, in contrast, that moderate decreases in perfusion pressure, experimentally adjusted by manipulating intraocular pressure or mean arterial pressure, result in significant compensation in choroidal blood flow (Riva et al, 1997b; Bogner et al, 2011; Polska et al, 2007) (Fig.…”